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100’ - 300’ Area reserved for 100% replacement REVISED ON-SITE WELL AND SEPTIC SEPARATION DISTANCES 2007 (see reverse side for comments) 15’ - 300’ 100’ - 300’ 100’ - 300’ Manure Application 20’ Replacement well area 50’ MIN. 50’ MIN. ---PAGE BREAK--- Procedure/Policy Separation Distance Issues 1. Well Casing or Bedrock Depth less than 50 feet • “The listed water well separation distances from contaminant sources shall be increased by 50% whenever aquifer water enters the water well at less than 50 feet below grade. If a 50% increase in separation distances can not be achieved, then the greatest possible increase in separation distance shall be provided with such additional measures as needed to prevent contamination.” • To avoid this: o Install at least 50 feet casing. o Well grouting to at least 20 feet. 2. Course Gravelly Soil • “When these contamination sources are located in coarse gravel or are located upgrade and in the direct path of drainage to a water well, the water well shall be located at least 200 feet away from the closest part of these sources.” • 200 ft. from well to septic system is needed in Cortland County aquifer areas, usually where percolations rates are less than 10 mpi. 3. Manure Application • “Based upon on-site evaluations of agricultural properties done per agricultural environmental management (AEM) or comprehensive nutrient management plan (CNMP) programs by a certified nutrient management planner or soil and water conservation district (SWCD) official, water wells may be located a minimum of 100 feet from areas subject to land spreading of manure.” • Need 200 ft. from well to manure application. • Ask for verification of CNMP from Soil and Water to reduce this distance to 100 ft. Cortland County Health Department February 2008